cleanup readdir

lib/plugins/html/filmstrip.js

@@ -1,6 +1,8 @@
 'use strict';
 
 const fs = require('fs');
+const { promisify } = require('util');
+const readdir = promisify(fs.readdir);
 const path = require('path');
 
 function findFrame(videoFrames, time) {
@@ -109,7 +111,7 @@ function findTimings(timings, start, end) {
   return timings.filter(timing => timing.value > start && timing.value <= end);
 }
 module.exports = {
-  getFilmstrip(browsertimeData, run, dir, options) {
+  async getFilmstrip(browsertimeData, run, dir, options) {
     if (
       !options.browsertime.video ||
       options.browsertime.videoParams.createFilmstrip === false
@@ -120,7 +122,7 @@ module.exports = {
     if (browsertimeData) {
       metrics = getMetricsFromBrowsertime(browsertimeData);
     }
-    const files = fs.readdirSync(
+    const files = await readdir(
       path.join(dir, 'data', 'video', 'images', run + '')
     );
     const timings = [];

lib/plugins/html/htmlBuilder.js

@@ -227,7 +227,7 @@ class HTMLBuilder {
       // as median run all over in the HTML
       const medianPageInfo = runPages[medianRun.runIndex - 1];
       let filmstripData = medianPageInfo.data.browsertime
-        ? filmstrip.getFilmstrip(
+        ? await filmstrip.getFilmstrip(
             medianPageInfo.data.browsertime.run,
             medianRun.runIndex,
             this.storageManager.getFullPathToURLDir(url),
@@ -284,7 +284,7 @@ class HTMLBuilder {
         );
 
         const filmstripData = pageInfo.data.browsertime
-          ? filmstrip.getFilmstrip(
+          ? await filmstrip.getFilmstrip(
               pageInfo.data.browsertime.run,
               iteration,
               this.storageManager.getFullPathToURLDir(url),